*{
    margin:0;
    padding: 0;
}
.box {
    width: 50%;
    margin: auto;
    position: relative;
    div {
        display: inline-block;
    }
    .left {
        width: 15%;
        ul {
            li {
                list-style: none;
                text-align: center;
            }
        }
    }
    .right {
        width: 70%;
        background: yellow;
        position: absolute;
        top: 0;
    }
}

